We also searched following websites: the WHO (https://www.who.int/), CDC (Centers for Disease Control and Prevention, https://www.cdc.gov/), NICE (National Institute for Health and Clinical Excellence, https://www.nice.org.uk/), National Health Commission of the People’s Republic of China (http://www.nhc.gov.cn/), and National Administration of Traditional Chinese Medicine (http://www.satcm.gov.cn/).